Frequencies for first 10,000 rows of versionnum variable in plan2015 dataset :

    Version |
     Number |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |         24        0.24        0.24
          2 |        270        2.70        2.94
          3 |        159        1.59        4.53
          4 |      1,234       12.34       16.87
          5 |      1,004       10.04       26.91
          6 |      1,092       10.92       37.83
          7 |      1,892       18.92       56.75
          8 |      1,282       12.82       69.57
          9 |        697        6.97       76.54
         10 |        550        5.50       82.04
         11 |        609        6.09       88.13
         12 |         12        0.12       88.25
         13 |        217        2.17       90.42
         14 |         92        0.92       91.34
         15 |        349        3.49       94.83
         16 |        137        1.37       96.20
         17 |         55        0.55       96.75
         18 |         65        0.65       97.40
         19 |        153        1.53       98.93
         20 |        107        1.07      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 9 Dec 2017